HoDoKu Solving Technique Index: Example for "Empty Rectangle"

Solving Technique Example

Original sudoku:

..86........759...6..1...9.......83.9.6.....5..24.5.....5..438.3.18.2..6......2..

Use the following line if you want to load the sudoku in HoDoKu:

:0402:1:+5+986+4+3..+2..+3759+6+4+86+7+41+2+8+59+3+4+5+7+2..83.9.6+3.+7+4+25.+324.5.+6...5+9.438.3+418+72+9+56..+9+5+3.2.+4::149:

The following representation can be pasted in most Sudoku programs:

.-----------.------------.-------------.

| 5   9   8 | 6  4    3  | 17  17  2   |

| 12  12  3 | 7  5    9  | 6   4   8   |

| 6   7   4 | 1  2    8  | 5   9   3   |

:-----------+------------+-------------:

| 4   5   7 | 2  169  16 | 8   3   19  |

| 9   18  6 | 3  18   7  | 4   2   5   |

| 18  3   2 | 4  189  5  | 17  6   179 |

:-----------+------------+-------------:

| 27  26  5 | 9  16   4  | 3   8   17  |

| 3   4   1 | 8  7    2  | 9   5   6   |

| 78  68  9 | 5  3    16 | 2   17  4   |

'-----------'------------'-------------'

Representation of the step:

.-----------.-------------.--------------.

| 5   9   8 | 6   4    3  | 17  17   2   |

| 12  12  3 | 7   5    9  | 6   4    8   |

| 6   7   4 | 1   2    8  | 5   9    3   |

:-----------+-------------+--------------:

| 4   5   7 | 2   169  16 | 8   3   -19  |

| 9   18  6 | 3   18   7  | 4   2    5   |

| 18  3   2 | 4   189  5  | 17  6    179 |

:-----------+-------------+--------------:

| 27  26  5 | 9  *16   4  | 3   8   *17  |

| 3   4   1 | 8   7    2  | 9   5    6   |

| 78  68  9 | 5   3    16 | 2   17   4   |

'-----------'-------------'--------------'



Empty Rectangle: 1 in b5 (r7c59) => r4c9<>1